In message , Harry Bloomfield
writes

Thanks Harry, actually the roof frame is wooden and there's scope to
reduce
it in width to some extent. Yes, the roof is asbestos.. is it
difficult or
impossible to cut down? If it means buying new roofing, so be it

It cuts easily enough, but it is the health and safety risks of doing
so. It is cement asbestos sheet, the lowest risk type of asbestos so I
understand. Fine if undisturbed, but there are issues with cutting or
drilling it.

Not really - if you keep it wet. The problem is that it becomes very
brittle. The other problem will be getting drilled holes to line up

If there was really such a danger from it, I would be dead by now

--
geoff